tty: ehv_bytecha: use memcpy_and_pad() in local_ev_byte_channel_send()

There is a helper for memcpy(buffer)+memset(the_rest). Use it for
simplicity.

And add a comment why we are doing the copy in the first place.

Signed-off-by: "Jiri Slaby (SUSE)" <[email protected]>
Cc: Laurentiu Tudor <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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